GH-141794: Fix reference leaks introduced in GH-142228

[markshannon]

• Issue: Compiling executors can result in excessively large amounts of machine code. #141794

[bedevere-bot]

🤖 New build scheduled with the buildbot fleet by @markshannon for commit fa5af0d 🤖

Results will be shown at:

https://buildbot.python.org/all/#/grid?branch=refs%2Fpull%2F142257%2Fmerge

If you want to schedule another build, you need to add the 🔨 test-with-refleak-buildbots label again.

[markshannon]

The s390x failures appear to timing related and aren't memory leaks.

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot x86 Debian Installed with X 3.x (no tier) has failed when building commit 6825d5c.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/#/builders/1244/builds/6846) and take a look at the build logs.
4. Check if the failure is related to this commit (6825d5c) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/#/builders/1244/builds/6846

Summary of the results of the build (if available):

==

Click to see traceback logs

Traceback (most recent call last):
  File �[35m"/buildbot/buildarea/3.x.ware-debian-x86.installed/build/target/lib/python3.15/test/test_annotationlib.py"�[0m, line �[35m160�[0m, in �[35mtest_nonexistent_attribute�[0m
    �[31mself.assertEqual�[0m�[1;31m(epsilon_anno, support.EqualToForwardRef("some | {obj, module}", owner=f))�[0m
    �[31m~~~~~~~~~~~~~~~~�[0m�[1;31m^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^�[0m
�[1;35mAssertionError�[0m: �[35mForwardRef('some | {module, obj}', owner=[79 chars]028>) != EqualToForwardRef('some | {obj, module}',[86 chars]028>)�[0m


Traceback (most recent call last):
  File �[35m"/buildbot/buildarea/3.x.ware-debian-x86.installed/build/target/lib/python3.15/test/test_annotationlib.py"�[0m, line �[35m160�[0m, in �[35mtest_nonexistent_attribute�[0m
    �[31mself.assertEqual�[0m�[1;31m(epsilon_anno, support.EqualToForwardRef("some | {obj, module}", owner=f))�[0m
    �[31m~~~~~~~~~~~~~~~~�[0m�[1;31m^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^�[0m
�[1;35mAssertionError�[0m: �[35mForwardRef('some | {module, obj}', owner=[79 chars]b80>) != EqualToForwardRef('some | {obj, module}',[86 chars]b80>)�[0m

[chris-eibl]

This should be linked with issue #141794 since it was introduced in the PR #142228 associated with it?

I took the liberty of doing that. Hope you don't mind.